FOR RENT: Top two floors of beautifully renovated brownstone, 1300 sq. ft., 2BR 2BA, eat-in kitchen, one block to parks and playgrounds. No broker&rsquo;s fee.<br><br>Susan and Alex Wendt have found their dream apartment.<br><br>Sure, the landlady is a little eccentric. And the elderly handyman drops some cryptic remarks about the basement. But the rent is so low, it&rsquo;s too good to pass up.<br><br>Big mistake. Susan soon discovers that her new home is crawling with bedbugs . . . or is it? She awakens every morning with fresh bites, but neither Alex nor their daughter Emma has a single welt. An exterminator searches the property and turns up nothing. The landlady insists her building is clean. Susan fears she&rsquo;s going mad&mdash;until a more sinister explanation presents itself: she may literally be confronting the bedbug problem from Hell.